JP6214550B2 - 干渉検知システムの動き補償のための方法及び装置 - Google Patents
干渉検知システムの動き補償のための方法及び装置 Download PDFInfo
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Description
本願は、2011年12月5日に出願された米国仮特許出願第61/566,860号及び2012年3月23日に出願された米国仮特許出願第61/614,662号の優先権を主張し、これらの内容は本明細書に参照により援用される。
追加的な非限定的な例示の実施形態が次に記載される。
時間領域における遅延は、式1、式2、及び式3に示されるように、周波数領域において線形位相項である。
Claims (24)
- 時間変化する外乱にさらされる検知ライトガイドのパラメータを測定するための光学インテロゲーションシステムであって:
光学干渉インテロゲータ;
前記検知ライトガイドの長さに対して光学干渉測定信号を検出するための、前記光学干渉インテロゲータに接続される、光学検出回路であって、前記検知ライトガイドは前記検知ライトガイドの長さに沿った対応する位置において一連のセグメントを含む、光学検出回路;及び
データ処理回路であって:
前記光学検出回路から前記干渉測定信号を受信し、
前記検知ライトガイドの前記長さに沿った前記一連のセグメントに対応する干渉測定データセグメントを含む干渉測定データセットを生成し、
前記検知ライトガイドに沿った対応する位置において前記干渉測定データセグメントの1又は複数のそれぞれをスペクトル領域に変換し、
対応する時変信号を決定するために各変換された前記干渉測定データセグメントを参照プロファイルと比較し、
前記時変信号から補償信号を決定し、
前記パラメータの前記測定を改良するために、前記時間変化する外乱に対して前記干渉測定データセットの少なくともある部分を補償するように前記補償信号を使用する、ように構成される、
データ処理回路;を有する、
光学インテロゲーションシステム。 - 前記光学インテロゲーションシステムは、インテロゲーション光源を含む光周波数領域リフレクトメトリ(OFDR)ベースのシステムであり、
前記光学干渉測定信号は、前記検知ライトガイドに沿った時間に応じた後方散乱振幅を示す、
請求項1に記載の光学インテロゲーションシステム。 - 前記時間変化する外乱は、前記検知ライトガイドの動きを含む、
請求項1に記載の光学インテロゲーションシステム。 - 前記干渉測定データセットは、前記干渉測定データセットの反射イベントに対して決定され、
前記データ処理回路は、受信された干渉データに、前記反射イベントの周りで窓を掛けるように構成される、
請求項1に記載の光学インテロゲーションシステム。 - 前記時変信号は位相信号であり、
前記データ処理回路は:
前記位相信号をアンラップすることによって、前記変換された干渉測定データセットから前記位相信号を抽出する;及び
前記アンラップされた前記位相信号から直線近似を取り除くことによって前記検知ライトガイドへの前記時間変化する外乱を表す非線形信号を決定する;
ように構成され、
前記非線形信号は前記補償信号である、
請求項1に記載の光学インテロゲーションシステム。 - 前記データ処理回路は、前記時間変化する外乱に対して前記干渉測定データセットを補償するために、前記非線形信号を前記干渉測定データセットから差し引くように構成される、
請求項5に記載の光学インテロゲーションシステム。 - 前記時変信号は位相信号であり、
前記データ処理回路は:前記スペクトル領域においてベースラインデータセットに対して比較することによって、前記スペクトル領域の前記変換された干渉測定データから前記位相信号を抽出する、ように構成される、
請求項1に記載の光学インテロゲーションシステム。 - 前記データ処理回路は:
前記干渉測定データセットを複数の測定データセグメントに分割するように;
前記複数の測定データセグメントのそれぞれを変換するように;
前記変換された複数の測定データセグメントのうちの複数を、対応する参照スペクトルデータセグメントと合成するように;
前記合成されたセグメントを平均するように;
前記平均されたセグメントから位相応答を決定するように;及び
前記位相応答に基づいて前記時変信号を決定するように;構成される、
請求項1に記載の光学インテロゲーションシステム。 - 前記データ処理回路は:
前記干渉測定データセットを複数の測定データセグメントに分割するように;
前記測定データセグメントに印加される、隣接する測定データセグメントの応答間のミスアライメントの量を示すひずみを決定するように、及び
前記決定されたひずみを、前記スペクトル領域において前記測定データセグメントの応答を整列させるよう使用するように、構成される、
請求項1に記載の光学インテロゲーションシステム。 - 前記データ処理回路は:
前記干渉測定データセットを複数の測定データセグメントに分割するように;
各前記データセグメントを対応する参照データセグメントと比較するように;
時間領域において前記参照データセグメントと前記データセグメントとの間のミスアライメントの量を示す時間遅延を決定するように;及び
前記時間領域において前記参照データセグメント及び前記データセグメントを整列させるために決定された前記時間遅延を使用するように;構成される、
請求項1に記載の光学インテロゲーションシステム。 - 前記検知ライトガイドは光ファイバであり、
前記データ処理回路は:前記光ファイバのひずみに対して前記干渉測定データセットを補償する、ように構成される、
請求項1に記載の光学インテロゲーションシステム。 - 前記データ処理回路は、動き、時間遅延、及び前記検知ライトガイドに沿ったひずみを決定するように、並びに、蓄積された動き、時間的なミスアライメント、及び前記検知ライトガイドに沿ったひずみに対して補償するように、構成される、
請求項1に記載の光学インテロゲーションシステム。 - 時間変化する外乱にさらされる検知ライトガイドのパラメータを測定するための方法であって:
前記検知ライトガイドの長さに対して光学干渉測定信号を検出するステップであって、
前記検知ライトガイドは前記検知ライトガイドの長さに沿った対応する位置において一連のセグメントを含む、ステップ;
検出された前記光学干渉測定信号から、前記検知ライトガイドの前記長さに沿った前記一連のセグメントに対応する干渉測定データセグメントを含む干渉測定データセットを生成するステップ;
前記検知ライトガイドに沿った対応する位置における前記干渉測定データセグメントの1又は複数のそれぞれをスペクトル領域に変換するステップ;
対応する時変信号を決定するために各変換された前記干渉測定データセグメントを参照プロファイルと比較するステップ;
前記時変信号から補償信号を決定するステップ;及び
前記パラメータの前記測定を改良するために、前記時間変化する外乱に対して前記干渉測定データセットの少なくともある部分を補償するように前記補償信号を使用するステップ;を有する、
方法。 - 前記方法は、インテロゲーション光源を含む光周波数領域リフレクトメトリ(OFDR)ベースのシステムを使用し、
前記光学干渉測定信号は、前記検知ライトガイドに沿った時間に応じた後方散乱振幅を示す、
請求項13に記載の方法。 - 前記時間変化する外乱は、前記検知ライトガイドの動きを含む、
請求項13に記載の方法。 - 前記干渉測定データセットは、前記干渉測定データセットにおける反射イベントに対して決定され、
前記方法は、受信された干渉データに、前記反射イベントの周りで窓を掛けるステップをさらに有する、
請求項13に記載の方法。 - 前記時変信号は位相信号であり、
前記方法はさらに:
前記位相信号をアンラップすることによって、前記変換された干渉測定データセットから前記位相信号を抽出するステップ;及び
前記アンラップされた前記位相信号から直線近似を取り除くことによって前記検知ライトガイドへの前記時間変化する外乱を表す非線形信号を決定するステップ;
を有し、
前記非線形信号は前記補償信号である、
請求項13に記載の方法。 - 前記時間変化する外乱に対して前記干渉測定データセットを補償するために、前記非線形信号を前記干渉測定データセットから差し引くステップをさらに有する、
請求項17に記載の方法。 - 前記時変信号は位相信号であり、
前記方法はさらに:
前記スペクトル領域においてベースラインデータセットに対して比較することによって、前記スペクトル領域の前記変換された干渉測定データから前記位相信号を抽出するステップを有する、
請求項13に記載の方法。 - 前記干渉測定データセットを複数の測定データセグメントに分割するステップ;
前記複数の測定データセグメントのそれぞれを変換するステップ;
前記変換された複数の測定データセグメントを、対応する参照スペクトルデータセグメントと合成するステップ;
前記合成されたセグメントを平均するステップ;
前記平均されたセグメントから位相応答を決定するステップ;及び
前記位相応答に基づいて前記時変信号を決定するステップ;をさらに有する、
請求項13に記載の方法。 - 前記干渉測定データセットを複数の測定データセグメントに分割するステップ;
前記測定データセグメントに印加される、隣接する測定データセグメントの応答間のミスアライメントの量を示すひずみを決定するステップ、及び
前記決定されたひずみを、前記スペクトル領域において前記測定データセグメントの応答を整列させるように、使用するステップ、をさらに有する、
請求項13に記載の方法。 - 前記干渉測定データセットを複数の測定データセグメントに分割するステップ;
各前記データセグメントを対応する参照データセグメントと比較するステップ;
時間領域において前記参照データセグメントと前記データセグメントとの間のミスアライメントの量を示す時間遅延を決定するステップ;及び
前記時間領域において前記参照データセグメント及び前記データセグメントを整列させるために決定された前記時間遅延を使用するステップ;をさらに有する、
請求項13に記載の方法。 - 前記検知ライトガイドは光ファイバであり、
前記方法はさらに:前記光ファイバのひずみに対して前記干渉測定データセットを補償するステップ、を有する、
請求項13に記載の方法。 - 動き、時間遅延、及び前記検知ライトガイドに沿ったひずみを決定するステップ、並びに、
蓄積された動き、時間的なミスアライメント、及び前記検知ライトガイドに沿ったひずみに対して補償するステップ、をさらに有する、
請求項13に記載の方法。
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